Quadrature Demodulator

The AD8348 high performance broadband quadrature demodulator is designed to enable IF-to-baseband conversion from 50 MHz to 1 GHz. In addition to the demodulator, which includes a dual mixer core and local oscillator phase splitter, the AD8348 integrates a 45 dB linear-in-dB variable-gain amplifier (VGA) and single-ended to differential amplifiers for driving baseband ADCs. With high linearity, excellent amplitude/phase balance, and 60 MHz demodulation bandwidth, the AD8348 enables most high-order modulation formats, including QAM, QPSK, and 8-PSK. It is specified for use over the  40°C to +85°C temperature range.